NASA Developing Air Traffic Control System for Drones
If you don't think that drones are a problem today, you have to admit that drones will be a problem soon. As they get even cheaper and easier to fly (and especially as they start to fly themselves more and more), everyone is going to be able to have a drone. And even worse than that, all those companies who came up with ridiculous drone delivery publicity stunts will start to seriously think that "hey, maybe this can work!"
I'm pretty sure that the whole urban drone delivery thing is still probably never (or almost never) going to happen, but under some very specific circumstances, certain aspects of it (like repetitive point-to-point delivery) might make sense to put into practice. The U.S. Federal Aviation Administration is a little bit behind on all of this, but NASA is working to get ahead, by developing an autonomous drone traffic management program.